Contents of TIR (Cont) SpeciesOn FC StackOn BOPOn Storage FormaldehydeReacts, lost performance (reversible?) Unknown Formic AcidReacts, lost performance (reversible?) Unknown Sulfur CompoundsReacts, lost performance (irreversible!!!) Unknown AmmoniaDegrades membrane ionomer conductivity Unknown WaterTolerant to > 500 ppm Ice adversely affects control components Affects cycle life of MeH